SINGAPORE - Before the Sunwolves arrived in Singapore on Wednesday (June 27), fly half Hayden Parker had never been to nor heard much about the Lion City, except that it is "really hot".

The Sunwolves face the Bulls in a Super Rugby fixture this Saturday, and like Parker, Bulls' utility back Jesse Kriel believes the Singapore heat and humidity will be a factor - in the lead-up to and including the match at the National Stadium.

"This is probably the hottest (conditions) I've ever trained in - I've lost 5kgs," exclaimed Kriel, speaking at the sidelines of a training session at the CCAB Stadium in Bukit Timah.

"But it has been really good. It's important now for us to go back to the hotel to get some good recovery and good rest."

Saturday's match will kick off after the sun goes down, at 7.55pm under the iconic dome of Singapore Sports Hub's crown jewel, and with the stadium's comfort cooling technology turned on. That will go some way in battling the heat and humidity of the Singapore climate.

Even though those conditions kick in at the world class facilities of the Sports Hub, Kriel believes the conditions will have an impact on the game.

"There is obviously a lot of humidity, and I think the conditions will be difficult to keep ball in hand," said the South African.

"The team that limits handling errors and makes the least mistakes in their half will be the team that comes out on top."